diff --git a/main.py b/main.py
index 12507d8..11e936d 100644
--- a/main.py
+++ b/main.py
@@ -62,11 +62,11 @@ while running:
 
     # 绘制世界
     screen.fill(COLORS["air"])
-    for x in range(len(world)):
-        for y in range(len(world[x])):
-            if world[x][y] != "air":
-                rect = pygame.Rect(x * BLOCK_SIZE, y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE)
-                pygame.draw.rect(screen, COLORS[world[x][y]], rect)
+    for row in world:
+        for block in row:
+            if block.id != "air":
+                rect = pygame.Rect(block.x * BLOCK_SIZE, block.y * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE)
+                pygame.draw.rect(screen, block.color, rect)
 
     # 绘制玩家
     pygame.draw.circle(screen, COLORS["player"], (player.x, player.y), 10)
diff --git a/module/block.py b/module/block.py
new file mode 100644
index 0000000..97bc36c
--- /dev/null
+++ b/module/block.py
@@ -0,0 +1,54 @@
+from module import COLORS
+
+class Block:
+    id = ''
+    color = ''
+    flowable = False # 可流动
+    fallible = False # 可下坠
+    collision = True # 可以碰撞
+
+    def __init__(self, x: int, y: int):
+        self.x = x
+        self.y = y
+
+
+class GrassBlock(Block):
+    id = 'grass'
+    color = COLORS.get(id)
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
+
+
+class DirtBlock(Block):
+    id = 'dirt'
+    color = COLORS.get(id)
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
+
+
+class SandBlock(Block):
+    id = 'sand'
+    color = COLORS.get(id)
+    flowable = True
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
+
+
+class StoneBlock(Block):
+    id = 'stone'
+    color = COLORS.get(id)
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
+
+
+class AirBlock(Block):
+    id = 'air'
+    color = COLORS.get(id)
+    collision = False
+
+    def __init__(self, x: int, y: int):
+        super().__init__(x, y)
diff --git a/module/utils.py b/module/utils.py
index 1f1df50..3c2da17 100644
--- a/module/utils.py
+++ b/module/utils.py
@@ -1,9 +1,10 @@
 import random
 from module import WIDTH, BLOCK_SIZE, HEIGHT
+from module.block import StoneBlock, GrassBlock, DirtBlock, AirBlock, Block
 
 
 # 生成地形
-def generate_terrain():
+def generate_terrain() -> list[list[Block]]:
     world = []
     ground_level = HEIGHT // BLOCK_SIZE // 2
 
@@ -12,13 +13,13 @@ def generate_terrain():
         height = ground_level + random.randint(-3, 3)
         for y in range(HEIGHT // BLOCK_SIZE):
             if y > height + 2:
-                column.append("stone")
+                column.append(StoneBlock(x, y))
             elif y == height:
-                column.append("grass")
+                column.append(GrassBlock(x, y))
             elif y > height - 3:
-                column.append("dirt")
+                column.append(DirtBlock(x, y))
             else:
-                column.append("air")
+                column.append(AirBlock(x, y))
         world.append(column)
 
     return world
\ No newline at end of file